Abstract

This memo specifies modifications required to Dual-Stack Lite (DS-
Lite) so that both IPv4 hosts can receive multicast data from IPv4
servers.
The DS-Lite solution is based on DS-Lite Basic Bridging BroadBand
element (B4) proxying Internet Group Management Protocol (IGMP) and
then tunneling IGMP messages over IPv4-in-IPv6 softwire to DS-Lite
Address Family Transition Router element (AFTR). IPv4 multicast data
received at AFTR is tunneled over IPv4-in-IPv6 softwire to B4 and
then delivered to the hosts. This solution integrates well with DS-
Lite unicast solution by using IPv4-in-IPv6 softwire and works with
unicast IPv6 network connecting B4 with AFTR.